used the TST for 2 years without a problem. I do use the repeater on my Jeep. I have both the flow thru and the original ones. The flow thru's stick out too far to put on my Jeep. One tip- I use an egg carton to store the 10 units when I shut down for the winter months. I mark the egg carton identifying each wheel to keep them straight for re-installing next spring. I tape it shut to keep them from spilling out. Makes checking the tire pressure each morning before starting out a snap. Had a blow out on my last trip and the bang from my tire was immediately matched by the warning buzzer from my TST. Wouldn't leave home without them.